Keystones — Lintel
Five GCSE retrieval questions · 19 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0028 in standard form
Answer: 2.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 14.37cm -
4. Ratio Mixed ratio problems
Simplify: 12:10:6
Answer: 6:5:3 -
5. Statistics Mean
Calculate the mean of: 8, 33, 26, 16, 28, 49, 21. Give your answer to 2 decimal places
Answer: 25.86